Paper-making machinery



March 24, 1931. H. l.. KUTTER PAPER MAKINQMACHIN'ERY Filed Deo. 10, 1928 .MEW

/NVENTOR A TTORNE YJ Aso Patented Mar. 24, 1931 UNITED STATES PATENT OFFICE HERMAN I.. KUTTEB, F HAMILTON, OHIO, ASSIGNOR TO THE BLACK-CLAWSON' COM- PANY, 0F HAMILTON, OHIO, A. CORPORATION OF OHIO PAPER-MAKING MACHINERY Application led December 10, 1928. Serial No. 325,039.

This invention relates to paper making machinery or the like, and more particularly .to machinery of this character having means for cleaning and scraping the surface of a revolving rollor c` linder.

One object of t e invention is the provision, in paper making machinery or the like, of a doctor having a blade supporting body portion which is adjustably pivoted about an 1D axis displaced from the longitudinal axis of the body portion so that the eiective .pressure on the doctor resulting from the weight of the body portion may be varied as desired.

Another object of the invention is the pro- 16 vision of a doctor having a hollow body portion pivotally supported about an axis spaced from its longitudinal axis, the hollow body portion having openings spaced along its length.

Other objects and advantages of the invention will be apparent from the following description and from the accompanying drawn the drawing, in which like characters of 25 reference designate like, parts in the several views,- Fig. 1 is a side elevation of aportion of a paper makingmachinekembodying the present invention;

Fig. 2 is a section taken transversely through a doctor; and

Fig. 3 is a section on the line 3 3 of Fig. 2. The invention as herein disclosed relates to paper making machinery employing a scraper 0r doctor for cleaning or scraping the surface of a revolving roll such as a drying cylinder, press roll, calendarroll or the like. The drawing discloses the invention as applied to a drier having a series of drying rolls o adapted to receive the paperweb-and remove A water from the .pa er. 'As shown, the machineucomprises a rame having frame, sides l10, and 11 spaced 4transversely of the drier vfor supporting a series vof revolving drying rolls 12, 13,14 and 15,.these drying rolls being `suitably arranged so that the paper may travel from one to the other while the water content is being removed from it by the heat of the rolls. Each of the rolls is scraped or cleaned by a device commonly termed a doctor, the doctors 17,18 and 19 cooperating with the rolls 1 2, 18 and 14 respectively, these doctors extending transversely of the ma'- clnne between the spaced frame sides and 11 by which they are supported.

E ach doctor comprises a scraping blade 20 which is fixed to ak body portion 21 by suitable screws or the like 22. The blade is relatively light and flexible being made of any suitable material such as steel so that sufficient flexibility for desired operation is obtalned, the flexibility of the blade permitting the scraping edge to follow the contour of the roll with which it cooperates even though the latter should not be perfectly straight, and efective scraping and cleaningV of the roll is thus produced. The body portion 21 of the doctor is shown 1n the form of a hollow bar or pipe, and as the doctor and drying rolls are usually many feet in length the body portion is made quite rigid and heavy to adequately support the doctor blade and keep it from sagging at the middle. This body portion is pivotally mounted for rotation about an axis spaced from its longitudinal axis so that the weight of the bar is effectiveto press the doctor against the roll with suicient force for effective scraping operation without' requiring the use of additional pressure weights or springs, ordinarily employed. Provided on the inner side of each frame sideY 10 and 11 is a mounting plate 25 which is preferably held in place by bolts 26 and 27. One of these bolts extends through a slotted opening 22 in the mounting plate -so that when the parts are assembled even though they should not be perfectly made the mounting plate may be positioned properly on the frame. On the mounting plate 25 is a boss 28 to which is adjustably fixed a member 29, shown in the form of a clamp having a split side providing spaced lugs 30 which may be drawn together by a bolt 31 to firmly ix the clamp member 29 in position. Another similar clamp member 32 is held firmly in position on the end of the body portion 21 of the doctor by a bolt 33 which may be tightened to draw the spaced lug ends of this clamp towards one another and cause it to securely grip the end of the doctor body. The two clamp members 29 and 32 which are normally in axial alignment, are interconnected by a pivot connection 35 shown in the form of a stud 36 threaded in one of the clamp portions and rotatably mounted in the other. The body portion of the doctor is thus mounted for pivotal movement about the axis of the stud 36, which is spaced from the longitudinal axis of the doctor body and, as shown, lies outside-of the doctor body and to one side thereof so that the weight of the comparatively heavy body portion 21 is effective by gravitational pull to hold the doctor blade in effective scraping position against the roll with which it cooperates. It will be understood that both ends of the doctor body are similarly supported upon the two frame sides of the machine. As shown in Fig. 2, the doctor blade lies below the doctor body 21, the stud 364 being positioned below the doctor body and between the scraping edge of the blade and the center of the body portion so that the weight of the body portion, which tends to move clockwise as seen in this ligure, holds the doctor blade in effective scraping engagement with the roll.

The amount of pressure effective on the doctor blade may be readily varied as the clamp members 29 and 32 are adjustably fixed to the frame and to the doctor body respectively. Where increased pressure of the doctor blade is desired, the two clamp bolts 31 and 33 are loosened and both clamps are adjusted about the center of the doctor body and the aligned boss 28 of the frame, the position of the stud 36 being adjusted toward the roll. The clamp bolts 31 and 33 are then tightened and the doctor will be supported so that its weight will be more effective on the doctor, but without causing any change in the axis of the doctor bodyl relatively to the supporting boss 28 or relatively to the roll. l

The body portion 21 of the doctor is suiiciently heavy so that its weight causes the flexible doctor blade to be Dressed against the roll with sufficient force to effectively clean and scrape the roll without necessitatin the use of additional weights acting to hol the doctor blade against the roll, it having been found that if theblade is ofl a flexible nature so it may follow surface irregularities in the roll the weight of the doctor itself, supported in the manner described, is enough to press the blade against the roll for effective clean- :ing or scraping action. Since substantlally the entire weight of the doctor is effective in holding the blade against the roll, the

ld octor as a whole is considerably lighter than prior constructions in which rigid-blades are held against a roll under great pressure applied by additional loading weights, or 1n which doctors were so mounted that the heavy portion of the doctor was not effective on the doctor blade tending to hold it against the roll. The adjustability of the doctor herein disclosed combined with the flexibility of the blade employed, cooperate in the creation of an efficient yet comparatively 1i ht doctor and one in which the pressure o the blade against the roll can be very readily changed to suit varying conditions. Furthermore the device is quite adaptable as to location, as the pivot axis about which the' body portion of the doctor issupported may lie either between the body portion and the blade edge, as shown in Fig. 2, or the pivot axis 38, see

Fig. 1, may be remotely positioned from the doctor blade with the body portion of the doctor lying between the blade and its pivot axis. v

Where the doctor is empoyed on a drying machine or the like, an air iiow may be supplied through the hollow body portion of the doctor, the latter having a series of openings 4() spaced along it so that' streams of air are directed outwardly therefrom. These air streams may be employed for assisting the drying action and as shown by arrows in Fig. 1 may be directed from the roll with which the doctor cooperates, this air thus traveling between the two adjacent rolls 12 and 14 so that moisture and moisture retaining air is carried away from the proximity of the paper carried by these rolls. The air is supplied t0 the hollow doctor body through one or both of its ends which register at all times with ported. An opening 41 in the frame side 10 permits air supplied to the hollow interior of this frame side to flow into the doctor body 21, air being furnished to the hollow interior of the frame side 10 throu h a. suitable inlet passage 42 connected to a lower or the like supplying dry and preferably warm air to the machine. Registration of the openings in the frame and mounting plate with the hollow end of the doctor body is always maintained even when the position of the clamps 29 and 32 is changed, since the latter are adjusted without bodily displacing the doctor body 21. v l

While the form of apparatus herein described constitutes aA preferred embodiment of the invention, it is toY be understood that the invention is not limited to this precise scope of the invention which is dened in the appended claims. What is claimed is:

prising a flexible blade, and a bodyportion to which said blade is xed, a plurality of adjacent interconnected members for pivotally supporting said body portion so that. itsweight is elective to ,hold the doctor in op- 1. A doctor of the class describaiam;l

erative position, said members bein adjustable about the axis of the body portlon' while maf/,aco

their relative positions with respect to one another are maintained.

2. A doctor of the class described comprising a iexible blade, and a body portion to which said blade is fixed, and means pivotally sup orting opposite ends of said body portion or movement aboutan axis lying outside of said body portion, so that the weight of the body portion is eiective to hold the doctor in operativel position, said means being adjustable throu h 360 about the axis o said body portion or varying the pressure on the blade. 3. A doctor of the class described comprising' a flexible blade, and a body portionr to whlch said blade is fixed, supporting means positioned axially of said body portion, an pivotally interconnected members adjustably clamped to said body portion and said support means.

4. In a device of the class described, a roll, a doctor, a plurality of adjacent interconnected members pivotally supportin said doctor for cooperative association wit said roll with the weight of the doctor effective to press the doctor against the roll, and provision for adjustin -said members co-axiall touvary the eiective pressure against sai ro 5. In a device of the class described, a xed frame, a roll, a doctor comprisin a iexible blade and a rigid transverse bar xed thereto, supporting means pivotally mounting said bar so that the weight of the bar is eiective to hold'the blade a ainst the roll, and rovision for adjusting te pivotal axis of said bar relatively to said'roll, ing an interconnected pair of co-axial split clamps one adjustably clam ed directly to the bar and the other adjustdbly clamped to the frame.

6. In a paper making machine, a roll spaced frame portions at opposite ends oi said roll, a flexible doctor blade, a rigid bar carrying said blade and extending between said frame portions, pivotally interconnected members, one attached to said bar and one atand compristached to one of said frame portions and piv- P otally Vsupporting said bar about an axis spaced away from its center, the weight of the bar Iand the doctor blade being suiiicient to press the doctor against the roll for eifective operation.A a l 7. In, a 'paper making machine, a roll, spaced frame portions at opposite ends lof said roll, a flexible doctor blade, a rigid bar carrying said blade and extending between said frame portions, members, one attached to said bar and one attached to one of said frame portions and pivotally supporting said bar about an axis spaced away from its center so that its weight Atis effective to hold the blade against the roll,

and @provision for adjusting said members Vto which said blade is 4frame mem er, a paper carrying roll a doctor adapted constant registration with pivotally interconnected about the axis of said bar for varying-the eiective force on the blade.

8. In a paper drying machine of the class described, a fixed frame member, a drying roll rotatably supported thereby, a doctor adapted to cooperate with said roll and comprising a hollow body portion having a doctor blade thereon, said body portion having openings through which a supply of air passes, andmeans for pivotally supporting said body portion about a line displaced from its axis.

9. A doctor of the class described comprising a iiexible blade, and a body portion fixed, a plurality of members for movably supporting said body d portion so that its weight is effective to hold the doctor in operative position, said members being simultaneously adjustable through equal amounts while their relative positions are maintained sothat the body portion may be supfported from a point on either side thereo 10. In a paper making machine, a roll, spaced frame portions at opposite ends of said roll a doctor blade, a rigid bar carrying said bla e and extending between said frame portions, movably interconnecting members, one attached to said bar and one pivotally attached to one o -said frame portions for adjustment substantially about the axis of the bar for the pivotal support of said bar about an axis spaced therefrom.

11. In a aper ma g machine, a fixed tatablysupported thereby, to cooperate with said roll and comprising a hollow body portion having a doctor blade thereon, said body portion having openings through which iuid may be supplied, said fixed frame member having an opening 1n the end of said hollow body portion, means for pivotally supporting said body portion about a line displaced from its axis, and provlsion for adjusting the pivotal point of support of said body portion while the end of the body ortion 1s maintained in re 'stration with the opening in the frame mem er.

In testimony whereof I hereto affix my signature.

' HERMAN- L. KUTTER. 

